Regioselective and Stereospecific Cross-Coupling of Primary Allylic Amines with Boronic Acids and Boronates through Palladium-Catalyzed CN Bond Cleavage
作者:Man-Bo Li、Yong Wang、Shi-Kai Tian
DOI:10.1002/anie.201109171
日期:2012.3.19
The NH2 group serves as an effective leaving group in the palladium‐catalyzed regioselective and stereospecific title reaction (see scheme). The reaction works well with aryl‐ and alkenylboronic acids and aryl‐, alkenyl‐, allyl‐, and benzylboronates, and complete transfer of chirality has been achieved when using α‐chiral primary allylic amines as the allylic electrophiles.
Organogold(I) Phosphanes in Palladium-Catalyzed Cross-Coupling Reactions in Aqueous Media
作者:Miguel Peña-López、Luis A. Sarandeses、José Pérez Sestelo
DOI:10.1002/ejoc.201201720
日期:2013.5
Cross-coupling reaction of organogold(I) phosphanes with organic electrophiles in aqueousmedia has been investigated. Reactions between isolated aryl-, alkenyl-, or alkynylgold(I) phosphanes and aryl halides or triflates, alkenyl halides, and allyl acetates proceed under palladium catalysis conditions at room temperature or 80 °C in water with THF as a co-solvent. The couplingreactions give good yields
The palladium-catalyzed reaction of γ-silylated allyl acetates with water in the presence of CsF induces a previously unprecedented 1,2-shift of a substituent on silicon to produce allylsilanes in situ. The catalytic activity of the palladium increased when using an electron-poor phosphine ligand possessing fluorinated substituents. Further investigation of the reaction revealed that the approximate
Rhodium-Catalyzed Allylic Substitution Reactions with Indium(III) Organometallics
作者:Ricardo Riveiros、Rubén Tato、José Pérez Sestelo、Luis A. Sarandeses
DOI:10.1002/ejoc.201200104
日期:2012.5
novel rhodium-catalyzed allylic substitution reaction using indium organometallics is reported. Aryl- and heteroarylindium reagents reacted in THF at 80 °C with primary and secondary allyl halides and their derivatives under rhodium(I) catalysis to afford the α-substituted products in good yields and with high regio- and stereoselectivity. The reaction takes place with substoichiometric amounts of
Selective Deoxygenation of Allylic Alcohol: Stereocontrolled Synthesis of Lavandulol
作者:Hee Jin Kim、Liang Su、Heejung Jung、Sangho Koo
DOI:10.1021/ol200779y
日期:2011.5.20
Selective deoxygenation of allylicalcohol can be successfully carried out by the formation of alkoxyalkyl ether (EE or MOM), followed by Pd(dppe)Cl2-catalyzed reduction with LiBHEt3. (+)-S-Lavandulol has been efficiently synthesized by the application of this protocol to the diol derived from the Pb(OAc)4-promoted oxidative ring-opening of (−)-R-carvone. This deoxygenationmethod is general and selective
通过形成烷氧基烷基醚(EE或MOM),然后用LiBHEt 3催化Pd(dppe)Cl 2催化还原,可以成功地进行烯丙醇的选择性脱氧。通过将该方案应用于衍生自Pb(OAc)4促进的(-)- R-香芹酮的氧化开环的二醇,已有效地合成了(+)- S - Lavandulol。该脱氧方法对烯丙基醇是通用的和选择性的。